adj. 1. a. Of, relating to, or arranged like rays or radii. b. Radiating from or converging to a common center. c. Having or characterized by parts so arranged or so radiating. 2. Moving or directed along a radius. 3. Anatomy Of, relating to, or near the radius or forearm. 4. Developing symmetrically about a central point. n. 1. A radial part, such as a ray, spoke, or radius. 2. A radial tire. [Middle English, from Medieval Latin radiālis, from Latin radius, ray, spoke, radius of a circle; see RAY1.] radi·al·ly adv. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.